Ultrasonic surgical instruments
A surgical instrument. The surgical instrument may comprise a transducer and an end effector. The transducer may be configured to provide vibrations along a longitudinal axis at a predetermined frequency and may comprise a piezoelectric stack positioned along the longitudinal axis. The transducer also may comprise a first metallic end mass positioned along the longitudinal axis adjacent a first end of the piezoelectric stack and a second metallic end mass positioned along the longitudinal axis adjacent a second end of the piezoelectric stack. The length of the transducer may be greater than or equal to of one wavelength and less than ½ of one wavelength. The end effector may be coupled to the transducer and may extend along the longitudinal axis. The length of the transducer and the end effector may be a multiple of ½ of one wavelength.
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The present application claims the benefit under at least 35 U.S.C. §121 as a divisional of U.S. patent application Ser. No. 11/888,171 filed on Jul. 31, 2007, now U.S. Pat. No. 8,430,898, which is incorporated herein by reference in its entirety.
BACKGROUNDUltrasonic instruments, including both hollow core and solid core instruments are used for the safe and effective treatment of many medical conditions. Ultrasonic instruments, and particularly solid core ultrasonic instruments, are advantageous because they may be used to cut and/or coagulate tissue using energy in the form of mechanical vibrations transmitted to a surgical end effector at ultrasonic frequencies. Ultrasonic vibrations, when transmitted to organic tissue at suitable energy levels and using a suitable end effector, may be used to cut, dissect or coagulate tissue or to separate muscle tissue off bone. Ultrasonic instruments may be used for open procedures or minimally invasive procedures, such as endoscopic or laparoscopic procedures, wherein the end effector is passed through a trocar to reach the surgical site.
Activating or exciting the single or multiple element end effector (e.g., cutting blade, ball coagulator) of such instruments at ultrasonic frequencies induces longitudinal, transverse or tortional vibratory movement that generates localized heat within adjacent tissue, facilitating both cutting and coagulating. Because of the nature of ultrasonic instruments, a particular ultrasonically actuated end effector may be designed to perform numerous functions, including, for example, cutting and coagulating.
Ultrasonic vibration is induced in the surgical end effector by electrically exciting a transducer, for example. The transducer may be constructed of one or more piezoelectric or magnetostrictive elements in the instrument hand piece. Vibrations generated by the transducer section are transmitted to the surgical end effector via an ultrasonic waveguide extending from the transducer section to the surgical end effector. The waveguides and end effectors may be designed to resonate at the same frequency as the transducer. Therefore, when an end effector is attached to a transducer the overall system frequency is the same frequency as the transducer itself.
The transducer and the end effector may be designed to resonate at two different frequencies and when joined or coupled may resonate at a third frequency. The zero-to-peak amplitude of the longitudinal ultrasonic vibration at the tip, d, of the end effector behaves as a simple sinusoid at the resonant frequency as given by:
d=A sin(ωt)
where:
ω=the radian frequency which equals 2π times the cyclic frequency, f; and
A=the zero-to-peak amplitude.
The longitudinal excursion is defined as the peak-to-peak (p-t-p) amplitude, which is just twice the amplitude of the sine wave or 2A.
Ultrasonic surgical instruments may be divided into two types, single element end effector devices and multiple-element end effector devices. Single element end effector devices include instruments such as scalpels (e.g., blades, sharp hook blades, dissecting hook blades, curved blades) and ball coagulators. Single-element end effector instruments have limited ability to apply blade-to-tissue pressure when the tissue is soft and loosely supported. Substantial pressure may be necessary to effectively couple ultrasonic energy to the tissue. This inability to grasp the tissue results in a further inability to fully coapt tissue surfaces while applying ultrasonic energy, leading to less-than-desired hemostasis and tissue joining. In these cases, multiple-element end effectors may be used. Multiple-element end effector devices, such as clamping coagulators, include a mechanism to press tissue against an ultrasonic blade that can overcome these deficiencies.
One drawback of existing ultrasonic instruments is their size. The large size and bulkiness of existing ultrasonic instruments can make it more difficult for clinicians to manipulate the instruments in surgical environments where fine movement is required and can also obstruct the vision of the clinician. This may limit the usefulness of ultrasonic instruments in small surgical sites. Also, because of the bulkiness of existing transducers, many existing ultrasonic instruments position the transducer proximal from the end effector, requiring an extended, and often relatively inflexible wave guide. As a result, articulation of the end effector and blade may be difficult or impossible. This limits the usefulness of existing ultrasonic instruments in endoscopic and laparoscopic surgical environments.
SUMMARYIn one general aspect, the various embodiments are directed to a surgical instrument. The surgical instrument may comprise a transducer and an end effector. The transducer may be configured to provide vibrations along a longitudinal axis at a predetermined frequency and may comprise a piezoelectric stack positioned along the longitudinal axis. The transducer also may comprise a first metallic end mass positioned along the longitudinal axis adjacent a first end of the piezoelectric stack and a second metallic end mass positioned along the longitudinal axis adjacent a second end of the piezoelectric stack. The length of the transducer may be greater than or equal to ¼ of one wavelength and less than ½ of one wavelength. The end effector may be coupled to the transducer and may extend along the longitudinal axis. The length of the transducer and the end effector may be a multiple of ½ of one wavelength.
In another general aspect, the various embodiments are directed to another surgical instrument comprising a transducer and an end effector. The transducer may be configured to provide vibrations along a longitudinal axis at a predetermined frequency. The transducer may comprise a piezoelectric stack positioned along the longitudinal axis, a first metallic end mass positioned along the longitudinal axis adjacent a first end of the piezoelectric stack, and a second metallic end mass positioned along the longitudinal axis adjacent a second end of the piezoelectric stack. The end effector may extend along the longitudinal axis and be coupled to the transducer. According to various embodiments, the amplitude gain of the transducer may be equal to one.
In yet another general aspect, the various embodiments are directed to a surgical instrument. The surgical instrument may comprise a transducer configured to provide vibrations along a longitudinal axis at a predetermined frequency and a housing coupled to the transducer. The transducer may comprise a piezoelectric stack, a first metallic end mass and a second metallic end mass. The piezoelectric stack may be positioned along the longitudinal axis about ¼ of one wavelength from the first end of the transducer. The first and second metallic end masses may be positioned along the longitudinal axis adjacent first and second respective ends of the piezoelectric stack. According to various embodiments, the length of the transducer is equal to about one wavelength. Also, the transducer may define a first mounting point and a second mounting point, where the first mounting point is positioned ¼ of one wavelength from the first end of the transducer along the longitudinal axis, and the second mounting point is positioned % of one wavelength from a second end of the transducer along the longitudinal axis. The housing may be coupled to the transducer at the first and second mounting points.
In an additional general aspect, the various embodiments are directed to a surgical instrument comprising a flexible member, a transducer, and an end effector positioned distally from the transducer. The transducer may be coupled to a distal portion of the flexible member and may be positioned to provide vibrations along a longitudinal axis at a predetermined frequency. The transducer may comprise: a piezoelectric stack positioned along the longitudinal axis, a first metallic end mass and a second metallic end mass. The first and second metallic end masses may be positioned along the longitudinal axis adjacent first and second respective ends of the piezoelectric stack.
In another general aspect, the various embodiments are directed to a surgical instrument comprising a surgical device, a sleeve configured to receive the surgical device and a rail positioned along an interior portion of the sleeve. The surgical device may comprise a feature for receiving the rail and may be slidable along the rail. Also, the surgical device may comprise a transducer positioned to provide vibrations along a longitudinal axis at a predetermined frequency and an end effector positioned distally from the transducer.
In yet another general aspect, the various embodiments are directed to a surgical instrument comprising a first operation member and a second operation member. The first and second operation members may be pivotable towards one another about a pivot point. The surgical instrument also may comprise a transducer positioned along a longitudinal axis of the first operation member to provide vibrations at a predetermined frequency along the longitudinal axis. In addition, the surgical instrument may comprise an end effector coupled to the transducer and extending distally along the longitudinal axis. A clamp pad may be coupled to the second operation member and may move towards the end effector when the first operation member and the second operation member are pivoted towards one another about the pivot point.
The novel features of the various embodiments are set forth with particularity in the appended claims. The various embodiments, however, both as to organization and methods of operation, together with further objects and advantages thereof, may best be understood by reference to the following description, taken in conjunction with the accompanying drawings as follows.
Before explaining the various embodiments in detail, it should be noted that the embodiments are not limited in their application or use to the details of construction and arrangement of parts illustrated in the accompanying drawings and description. The illustrative embodiments may be implemented or incorporated in other embodiments, variations and modifications, and may be practiced or carried out in various ways. For example, the surgical instruments and blade configurations disclosed below are illustrative only and not meant to limit the scope or application thereof. Furthermore, unless otherwise indicated, the terms and expressions employed herein have been chosen for the purpose of describing the illustrative embodiments for the convenience of the reader and are not to limit the scope thereof.
Examples of ultrasonic surgical instruments and blades are disclosed in U.S. Pat. Nos. 5,322,055 and 5,954,736, 6,309,400 B2, 6,278,218B1, 6,283,981 B1, and 6,325,811 B1, which are incorporated herein by reference in their entirety. These references disclose ultrasonic surgical instrument designs and blade designs where a longitudinal mode of the blade is excited. The result is a longitudinal standing wave within the instrument. Accordingly, the instrument has nodes, where the longitudinal motion is equal to zero, and anti-nodes, where the longitudinal motion is at its maximum. The instrument's tissue effector is often positioned at an anti-node, maximizing its longitudinal motion.
Various embodiments will now be described to provide an overall understanding of the principles of the structure, function, manufacture, and use of the devices and methods disclosed herein. One or more examples of these embodiments are illustrated in the accompanying drawings. Those of ordinary skill in the art will understand that the devices and methods specifically described herein and illustrated in the accompanying drawings are non-limiting exemplary embodiments and that the scope of the various embodiments is defined solely by the claims. The features illustrated or described in connection with one exemplary embodiment may be combined with the features of other embodiments. Such modifications and variations are intended to be included within the scope of the claims.
It will be appreciated that the terms “proximal” and “distal” are used herein with reference to a clinician gripping the hand piece assembly 60. Thus, the end effector 50 is distal with respect to the more proximal hand piece assembly 60. It will be further appreciated that, for convenience and clarity, spatial terms such as “top” and “bottom” also are used herein with respect to the clinician gripping the hand piece assembly 60. However, surgical instruments are used in many orientations and positions, and these terms are not intended to be limiting and absolute.
The distal end of the end-bell 20 is connected to the proximal end of the transduction portion 18, and the proximal end of the fore-bell 22 is connected to the distal end of the transduction portion 18. The fore-bell 22 and the end-bell 20 have a length determined by a number of variables, including the thickness of the transduction portion 18, the density and modulus of elasticity of the material used to manufacture the end-bell 20 and the fore-bell 22, and the resonant frequency of the ultrasonic transducer 14. The fore-bell 22 may be tapered inwardly from its proximal end to its distal end to amplify the ultrasonic vibration amplitude as the velocity transformer 28, or alternately may have no amplification. A suitable vibrational frequency range may be about 20 Hz to 120 kHz and a well-suited vibrational frequency range may be about 30-100 kHz and one example operational vibrational frequency may be approximately 55.5 kHz, for example.
Piezoelectric stack 31 may include one or more piezoelectric elements 32, which may be fabricated from any suitable material, such as, for example, lead zirconate-titanate, lead meta-niobate, lead titanate, barium titanate or other piezoelectric ceramic material. Each of positive electrodes 34, negative electrodes 36, and the piezoelectric elements 32 may have a bore extending through the center. The positive and negative electrodes 34 and 36 are electrically coupled to wires 38 and 40, respectively. The wires 38 and 40 are encased within a cable 42 and electrically connectable to the ultrasonic signal generator 12 of the ultrasonic system 10.
The ultrasonic transducer 14 of the acoustic assembly 24 converts the electrical signal from the ultrasonic signal generator 12 into mechanical energy that results in primarily a standing acoustic wave of longitudinal vibratory motion of the ultrasonic transducer 14 and the end effector 50 at ultrasonic frequencies. In another embodiment, the vibratory motion of the ultrasonic transducer may act in a different direction. For example, the vibratory motion may comprise a local longitudinal component of a more complicated motion of the tip of the ultrasonic system 10. A suitable generator is available as model number GEN01, from Ethicon Endo-Surgery, Inc., Cincinnati, Ohio. When the acoustic assembly 24 is energized, a vibratory motion standing wave is generated through the acoustic assembly 24. The ultrasonic system 10 may be designed to operate at a resonance such that an acoustic standing wave pattern of a predetermined amplitude is produced. The amplitude of the vibratory motion at any point along the acoustic assembly 24 may depend upon the location along the acoustic assembly 24 at which the vibratory motion is measured. A minimum or zero crossing in the vibratory motion standing wave is generally referred to as a node (e.g., where motion is usually minimal), and a local absolute value maximum or peak in the standing wave is generally referred to as an anti-node (e.g., where motion is usually maximal). The distance between an anti-node and its nearest node is one-quarter wavelength (λ/4).
The wires 38 and 40 transmit an electrical signal from the ultrasonic signal generator 12 to the positive electrodes 34 and the negative electrodes 36. The piezoelectric elements 32 are energized by the electrical signal supplied from the ultrasonic signal generator 12 in response to a switch 44 to produce an acoustic standing wave in the acoustic assembly 24. The switch 44 may be configured to be actuated by a clinician's foot. The electrical signal causes the piezoelectric elements 32 to expand and contract in a continuous manner along the axis of the voltage gradient, producing longitudinal waves of ultrasonic energy. The straining of the elements causes large alternating compressional and tensile forces within the material. These forces in the piezoelectric elements 32 manifest as repeated small displacements resulting in large alternating compression and tension forces within the material. The repeated small displacements cause the piezoelectric elements 32 to expand and contract in a continuous manner along the axis of the voltage gradient, producing longitudinal waves of ultrasonic energy. The ultrasonic energy is transmitted through the acoustic assembly 24 to the end effector 50 via a transmission component or ultrasonic transmission waveguide 104. According to various embodiments, the waveguide 104, end effector 50 and blade 52 may all be referred to generally as the end effector.
In order for the acoustic assembly 24 to deliver energy to the end effector 50, all components of the acoustic assembly 24 must be acoustically coupled to the end effector 50. The distal end of the ultrasonic transducer 14 may be acoustically coupled at the surface 30 to the proximal end of the ultrasonic transmission waveguide 104 by a threaded connection such as a stud 48.
The components of the acoustic assembly 24 are preferably acoustically tuned such that the length of any assembly is an integral number of one-half wavelengths (nλ/2), where the wavelength λ, is the wavelength of a pre-selected or operating longitudinal vibration drive frequency fd of the acoustic assembly 24, and where n is any positive integer. It is also contemplated that the acoustic assembly 24 may incorporate any suitable arrangement of acoustic elements.
The ultrasonic end effector 50 may have a length substantially equal to an integral multiple of one-half system wavelengths (λ/2). A distal end or blade 52 of the ultrasonic end effector 50 may be disposed near an antinode in order to provide the maximum longitudinal excursion of the distal end. When the transducer assembly is energized, the distal end 52 of the ultrasonic end effector 50 may be configured to move in the range of, for example, approximately 10 to 500 microns peak-to-peak, and preferably in the range of about 30 to 150 microns at a predetermined vibrational frequency.
The ultrasonic end effector 50 may be coupled to the ultrasonic transmission waveguide 104. The ultrasonic end effector 50 and the ultrasonic transmission guide 104 as illustrated are formed as a single unit construction from a material suitable for transmission of ultrasonic energy such as, for example, Ti6A14V (an alloy of Titanium including Aluminum and Vanadium), Aluminum, Stainless Steel, or other suitable materials. Alternately, the ultrasonic end effector 50 may be separable (and of differing composition) from the ultrasonic transmission waveguide 104, and coupled by, for example, a stud, weld, glue, quick connect, or other suitable known methods. The ultrasonic transmission waveguide 104 may have a length substantially equal to an integral number of one-half system wavelengths (λ/2), for example. The ultrasonic transmission waveguide 104 may be preferably fabricated from a solid core shaft constructed out of material suitable to propagate ultrasonic energy efficiently, such as the titanium alloy discussed above, (e.g., Ti-6Al-4V) or any suitable aluminum alloy, or other alloys, for example.
The ultrasonic transmission waveguide 104 comprises a longitudinally projecting attachment post 54 at a proximal end to couple to the surface 30 of the ultrasonic transmission waveguide 104 by a threaded connection such as the stud 48. In the embodiment illustrated in
As shown in
The hub 62 of the sheath 58 is preferably constructed from ULTEM®, and the tubular member 64 is fabricated from stainless steel. Alternatively, the ultrasonic transmission waveguide 104 may have polymeric material surrounding it to isolate it from outside contact.
The distal end of the ultrasonic transmission waveguide 104 may be coupled to the proximal end of the end effector 50 by an internal threaded connection, preferably at or near an antinode. It is contemplated that the end effector 50 may be attached to the ultrasonic transmission waveguide 104 by any suitable means, such as a welded joint or the like. Although the end effector 50 may be detachable from the ultrasonic transmission waveguide 104, it is also contemplated that the end effector 50 and the ultrasonic transmission waveguide 104 may be formed as a single unitary piece.
The ultrasonic surgical instrument 100 may be sterilized by methods known in the art such as, for example, gamma radiation sterilization, Ethelyne Oxide processes, autoclaving, soaking in sterilization liquid, or other known processes. In the illustrated embodiment, an ultrasonic transmission assembly 102, which may be generally referred to as the end effector, may include the ultrasonic end effector 50 and the ultrasonic transmission waveguide 104. The ultrasonic end effector 50 and the ultrasonic transmission waveguide 104 are illustrated as a single unit construction from a material suitable for transmission of ultrasonic energy such as, for example, Ti6Al4V (an alloy of Titanium including Aluminum and Vanadium), Aluminum, Stainless Steel, or other known materials. Alternately, the ultrasonic end effector 50 may be separable (and of differing composition) from the ultrasonic transmission waveguide 104, and coupled by, for example, a stud, weld, glue, quick connect, or other known methods. The ultrasonic transmission waveguide 104 may have a length substantially equal to an integral number of one-half system wavelengths (nλ/2), for example. The ultrasonic transmission waveguide 104 may be preferably fabricated from a solid core shaft constructed out of material that propagates ultrasonic energy efficiently, such as titanium alloy (e.g., Ti-6Al-4V) or an aluminum alloy, for example.
In the embodiment illustrated in
The mounting points 506, 508 may take any suitable form. For example, in the embodiment shown in
In the embodiment shown in
The surgical instrument 2101 may comprise a transducer 2112, an end effector 2110, and a clamp arm 2106. The clamp arm 2106 may include a clamp pad 2108. In use, the clamp pad 2108 may be brought into contact with the end effector 2110 to provide a clamping force between tissue and the end effector 2110. For example, the surgical instrument may be maneuvered into position relative to the tissue. The end effector 2110 then may be energized and brought into contact with the tissue. According to various embodiments, the end effector 2110 may move toward the clamp arm 2106, or the clamp arm 2106 may move toward the end effector 2110.
The instruments disclosed herein can be designed to be disposed of after a single use, or they can be designed to be used multiple times. In either case, however, the instrument may be reconditioned for reuse after at least one use. Reconditioning can include any combination of the steps of disassembly of the instrument, followed by cleaning or replacement of particular elements, and subsequent reassembly. In particular, the instrument may be disassembled, and any number of particular elements or components of the instrument may be selectively replaced or removed in any combination. Upon cleaning and/or replacement of particular components, the instrument may be reassembled for subsequent use either at a reconditioning facility, or by a surgical team immediately prior to a surgical procedure. Those skilled in the art will appreciate that reconditioning of a instrument may utilize a variety of techniques for disassembly, cleaning/replacement, and reassembly. Use of such techniques, and the resulting reconditioned instrument; are all within the scope of the present application.
Preferably, the various embodiments described herein will be processed before surgery. First, a new or used instrument is obtained and if necessary cleaned. The instrument can then be sterilized. In one sterilization technique, the instrument is placed in a closed and sealed container, such as a plastic or TYVEK® bag. The container and instrument are then placed in a field of radiation that can penetrate the container, such as gamma radiation, x-rays, or high-energy electrons. The radiation kills bacteria on the instrument and in the container. The sterilized instrument can then be stored in the sterile container. The sealed container keeps the instrument sterile until it is opened in the medical facility.
It is preferred that the instrument is sterilized. This can be done by any number of ways known to those skilled in the art including beta or gamma radiation, ethylene oxide, steam.
Although various embodiments have been described herein, many modifications and variations to those embodiments may be implemented. For example, different types of end effectors may be employed. Also, where materials are disclosed for certain components, other materials may be used. The foregoing description and following claims are intended to cover all such modification and variations.
Other than the operating examples, or where otherwise indicated, all numbers expressing quantities of ingredients, processing conditions and the like used in the specification and claims are to be understood as being modified in all instances by the term “about”. Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained.
Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the disclosure are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical values, however, inherently contain certain errors, such as, for example, equipment and/or operator error, necessarily resulting from the standard deviation found in their respective testing measurements.
Also, it should be understood that any numerical range recited herein is intended to include all sub-ranges subsumed therein. For example, a range of “1 to 10” is intended to include all sub-ranges between (and including) the recited minimum value of 1 and the recited maximum value of 10, that is, having a minimum value equal to or greater than 1 and a maximum value of less than or equal to 10.
Any patent, publication, or other disclosure material, in whole or in part, that is said to be incorporated by reference herein is incorporated herein only to the extent that the incorporated materials does not conflict with existing definitions, statements, or other disclosure material set forth in this disclosure. As such, and to the extent necessary, the disclosure as explicitly set forth herein supersedes any conflicting material incorporated herein by reference. Any material, or portion thereof, that is said to be incorporated by reference herein, but which conflicts with existing definitions, statements, or other disclosure material set forth herein will only be incorporated to the extent that no conflict arises between that incorporated material and the existing disclosure material.
Claims
1. A surgical instrument, comprising:
- a first operation member;
- a second operation member, wherein at least one of the first operation member or second operation member is pivotable towards the other operation member about a pivot point;
- a transducer positioned along a longitudinal axis of the first operation member to provide vibrations along the longitudinal axis, wherein the transducer is at a position distal from the pivot point, and wherein the transducer comprises: a piezoelectric stack positioned parallel to the longitudinal axis; a first metallic end mass positioned parallel to the longitudinal axis adjacent a first end of the piezoelectric stack; a second metallic end mass positioned along the longitudinal axis adjacent a second end of the piezoelectric stack, wherein a length of the transducer is greater than ½ of one wavelength; a first mounting point positioned at a distal zero-displacement node of the transducer; and a second mounting point positioned at a proximal zero-displacement node of the transducer;
- an end effector coupled to the transducer and extending distally along the longitudinal axis; and
- a clamp pad coupled to the second operation member, wherein the clamp pad moves towards the end effector when the first operation member and the second operation member are pivoted towards one another about the pivot point.
2. The surgical instrument of claim 1, further comprising a first finger ring coupled to the first operation member at a point distal from the pivot point.
3. The surgical instrument of claim 2, wherein the first finger ring is rotatable about an axis perpendicular to the longitudinal axis.
4. The surgical instrument of claim 1, further comprising a support member positioned at the pivot point and configured to exert a torque on the first operation member and the second operation member, wherein the torque tends to pivot the first operation member and the second operation member away from one another.
5. The surgical instrument of claim 1, wherein the first operation member extends proximally from the pivot point and comprises a finger loop positioned proximally from the pivot point.
6. The surgical instrument of claim 5, wherein the first operation member is angled off of the longitudinal axis at a point positioned proximally from the pivot point.
7. A method for processing a surgical instrument for surgery, comprising:
- obtaining the surgical instrument of claim 1;
- sterilizing the surgical instrument; and
- storing the surgical instrument in a sterile container.
8. The surgical instrument of claim 1, wherein the first operation member is pivotable towards the second operation member about the pivot point and the second operation member is pivotable towards the first operation member about the pivot point.
9. The surgical instrument of claim 1, wherein the end effector comprises a waveguide coupled to the transducer and a blade coupled to the waveguide.
10. The surgical instrument of claim 1, further comprising a port for receiving a wire to couple the transducer to a surgical generator.
11. The surgical instrument of claim 1, wherein the transducer comprises a gain stage, wherein the gain stage comprises at least one of the first metallic end mass or the second metallic end mass, and wherein at least a portion of the gain stage has a cross-sectional area different than a cross-sectional area of the piezoelectric stack.
12. The surgical instrument of claim 1, wherein the first mounting point comprises a flange and the second mounting point comprises a groove.
13. The surgical instrument of claim 1, wherein the first mounting point comprises a groove and the second mounting point comprises a flange.
14. The surgical instrument of claim 1, wherein the first mounting point comprises a groove and the second mounting point comprises a groove.
15. The surgical instrument of claim 1, wherein the first mounting point comprises a flange and the second mounting point comprises a flange.
16. The surgical instrument of claim 1, wherein at least one of the first mounting point or the second mounting point comprises a flange, wherein the transducer further comprises a second piezoelectric stack, and wherein the flange is positioned between the piezoelectric stack and the second piezoelectric stack.
17. A surgical instrument, comprising:
- a first member, comprising: a transducer positioned along a longitudinal axis of the first member, wherein the transducer comprises: a piezoelectric stack positioned parallel to the longitudinal axis; a first metallic end mass positioned parallel to the longitudinal axis adjacent a first end of the piezoelectric stack; a second metallic end mass positioned along the longitudinal axis adjacent a second end of the piezoelectric stack, wherein a length of the transducer is greater than ½ of one wavelength; a first mounting point positioned at a distal zero-displacement node of the transducer; and a second mounting point positioned at a proximal zero-displacement node of the transducer; an end effector coupled to the transducer and extending distally along the longitudinal axis of the first member; and a first finger loop at a proximal portion of the first member, wherein the proximal portion of the first member is angled away from the longitudinal axis of the first member in a first direction;
- a second member, comprising: a clamp pad positioned along a longitudinal axis of the second member at a distal portion of the second member opposite the end effector; and a second finger loop at a proximal portion of the second member, wherein the proximal portion of the second member is angled away from the longitudinal axis of the second member in the first direction; and
- wherein the first member and the second member are pivotably coupled at a pivot point positioned distally from the first finger loop and the second finger loop, and wherein the end effector and the clamp pad are pivotable into contact with one another about the pivot point.
18. The surgical instrument of claim 17, wherein the first finger loop and the second finger loop are positioned parallel to a common plane.
19. The surgical instrument of claim 17, wherein the first finger loop is sized to fit more than one finger.
20. The surgical instrument of claim 17, wherein the second finger loop is sized to fit more than one finger.
21. The surgical instrument of claim 17, wherein the second member is pivotable towards the first member about the pivot point.
22. The surgical instrument of claim 17, wherein the first member is pivotable towards the second member about the pivot point.
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Type: Grant
Filed: Mar 28, 2013
Date of Patent: Sep 13, 2016
Patent Publication Number: 20130226208
Assignee: Ethicon Endo-Surgery, LLC (Guaynabo, PR)
Inventors: Eitan T. Wiener (Cincinnati, OH), Foster B. Stulen (Mason, OH), Michael J. Stokes (Cincinnati, OH), Karen K. Isaacs (Burlington, KY), William J. Kraimer (Mason, OH)
Primary Examiner: Ashley Fishback
Application Number: 13/852,539
International Classification: A61B 17/32 (20060101); A61B 17/30 (20060101); A61B 17/3205 (20060101); A61B 17/22 (20060101); A61B 17/00 (20060101); A61B 17/29 (20060101);